Geba and Gambia Rivers in West Africa

Sediments from the Geba River give a tan color to the waters off the coast of Guinea-Bissau, in West Africa (lower right quadrant). The river has a total length of about 340 miles (550 km). Before reaching the Atlantic, the river broadens into a wide estuary below Xime (where it is joined by the Corubal River), with a total width of about 10 miles (16 km) at Bissau.

Further north up the coast is the Gambia River, also a major river in West Africa. It runs 1,130 kilometres (700 mi) from the Fouta Djallon plateau in north Guinea westward through Senegal and The Gambia to the Atlantic Ocean at the city of Banjul. About 100 km from its mouth it gradually widens, to over 10 km wide where it meets the sea.